TROJ_FARFLI.IS
TrojanSpy:Win32/Agent.PI (Microsoft); Trojan.Panddos (Symantec); Backdoor.Win32.Hupigon.arqy, Backdoor.Win32.Hupigon.arqy (Kaspersky); Backdoor.Win32.Hupigon.arqy (v) (Sunbelt); Backdoor.Hupigon.95311 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
581,632 bytes
EXE
No
07 Nov 2012
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan drops the following copies of itself into the affected system:
- %System%\girl.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other System Modifications
This Trojan modifies the following file(s):
- %Windows%\Tasks\SA.DAT
- %Windows%\Prefetch\SVCHOST.EXE-3530F672.pf
(Note: %Windows% is the Windows folder, which is usually C:\Windows.)
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Prefetcher
Version = "11"
(Note: The default value data of the said registry entry is 11.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Prefetcher
StartTime = "2012/10/10-01:14:37"
(Note: The default value data of the said registry entry is 2011/12/21-02:22:02.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Prefetcher
TracesProcessed = "0"
(Note: The default value data of the said registry entry is 9.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Prefetcher
TracesSuccessful = "0"
(Note: The default value data of the said registry entry is 6.)
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Prefetcher
LastTraceFailure = "0"
(Note: The default value data of the said registry entry is 4.)
Dropping Routine
This Trojan drops the following files:
- %System%\tmp.bat
- %System%\girl.dat
- %Windows%\Prefetch\DRWTSN32.EXE-2B4B52AC.pf
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)
Other Details
This Trojan connects to the following possibly malicious URL:
This report is generated via an automated analysis system.
SOLUTION
9.300
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Prefetcher
- From: Version = "11"
To: Version = ""11""
- From: Version = "11"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Prefetcher
- From: StartTime = "2012/10/10-01:14:37"
To: StartTime = ""2011/12/21-02:22:02""
- From: StartTime = "2012/10/10-01:14:37"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Prefetcher
- From: TracesProcessed = "0"
To: TracesProcessed = ""9""
- From: TracesProcessed = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Prefetcher
- From: TracesSuccessful = "0"
To: TracesSuccessful = ""6""
- From: TracesSuccessful = "0"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Prefetcher
- From: LastTraceFailure = "0"
To: LastTraceFailure = ""4""
- From: LastTraceFailure = "0"
Step 3
Search and delete these components
- %System%\tmp.bat
- %System%\girl.dat
- %Windows%\Prefetch\DRWTSN32.EXE-2B4B52AC.pf
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_FARFLI.IS. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 5
Restore deleted/modified files and/or registry entries from backup
*Note: Only Microsoft-related files/keys/values will be restored. If this malware/grayware also deleted registry keys/values related to programs that are not from Microsoft, please reinstall those programs on your computer.
- %Windows%\Tasks\SA.DAT
- %Windows%\Prefetch\SVCHOST.EXE-3530F672.pf
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